Details of properties

Optical characteristics

Exhibiting an extraordinarily low level of birefringence, it also has a higher refractive index than polymethyl methacrylate (PMMA).

Comparison in light transmittance

Comparison of Stress Optical coefficient

Comparison of resins for optical applications in terms of characteristics

The low level of birefringence, high refractive index, and transparency derive from a molecular structure that has both stiff main chains and bulky side chains. With their high density, the stiff main chains exhibit a high refractive index, while bulky side chains lead to transparency due to their amorphous quality. The molecule itself has poor anisotropy that results in the low level of birefringence.

Comparison of refractive index and Abbe's number

APEL™ has a higher refractive index than PMMA, but their Abbe's number is almost equivalent.